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05-18-2017, 01:26 PM
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#1
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Junior Member
Join Date: May 2017
Location: Tarpon Springs, Florida
Posts: 16
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Onan Marquis 5500
Onan 5500 Marquis Gold would start and run for 7 min. or so, then shut down. Everyone contacted said it was the carb, so bought a new carb, exact same problem as with the old carb! What's next?
Now I am hearing it is the fuel pump! 
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05-18-2017, 01:33 PM
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#2
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Member
Winnebago Owners Club Ford Super Duty Owner
Join Date: Jul 2014
Posts: 67
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Had the same problem, if was the fuel pump over heating. Would start and run fine then stop with an error code.. They had some bad fuel pumps. Also removed one of the two fuel filters, it was part of the reason it was over heating the fuel pump. Found fuel pump on Amazon.
__________________
2007 Winnebago Voyage F35L Ford F53
2014 Honda CRV
1SG Retired US Army
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05-18-2017, 01:52 PM
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#3
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Senior Member
Fleetwood Owners Club Ford Super Duty Owner iRV2 No Limits Club
Join Date: Oct 2012
Location: Colorado Springs, CO
Posts: 1,111
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Assuming you checked things like fuel, fuel filter (originally there were two, but one was deleted/bypassed). Here is the pump i installed.
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
For the last two years no problems. My generator would stall while the RV was moving.
__________________
Mark
1999 Bounder 32H Ford V10, 2012 Ford Focus, Pretty DW, 1 cat. Retired USAF
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05-18-2017, 04:18 PM
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#4
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Senior Member
Fleetwood Owners Club Ford Super Duty Owner
Join Date: Jun 2012
Location: SoCal
Posts: 15,749
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Fuel pump will cause same/similar symptom. Also ensure the oil level is full to the tippy top, not just the full mark. It can inadvertently shut down thinking low oil level. I have been here with both these issues on a 5500.
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Vince and Susan
2011 Tiffin Phaeton 40QTH (Cummins ISC/Freightliner)
Flat towing a modified 2005 Jeep (Rubicon Wrangler)
Previously a 2002 Fleetwood Pace Arrow 37A and a 1995 Safari Trek 2830.
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05-19-2017, 12:08 AM
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#5
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Senior Member
Fleetwood Owners Club Freightliner Owners Club
Join Date: Nov 2005
Location: Alta Loma, Ca.
Posts: 266
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Our last MH had that same generator and had the same problem. The fuel pump went bad in 5 days, installed a new one that one lasted about a year.
Went to Napa Auto Parts bought fuel pump with the same pressure, installed it sold the MH 10 years later and never had another problem.
Marty
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Martin & Yani
2013 Fleetwood Expedition 38B
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05-19-2017, 04:32 AM
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#6
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Junior Member
Join Date: May 2017
Location: Tarpon Springs, Florida
Posts: 16
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Thank you all
WOW, you guys are great thanks for all the input, just bought the fuel pump on Amazon!
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05-19-2017, 04:35 PM
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#7
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Senior Member
Join Date: Jul 2015
Location: Watertown NY USA
Posts: 6,517
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When I bought my MH 2 years ago I serviced the generator before I even started it. I was going to change the fuel filter but the only source I found at the time for the filter was ONAN. I removed the filter, threw it in the garbage and installed a nipple in the filter's place. Then I cut a section of line out of the fuel line between the fuel tank and the fuel pump and installed a filter ahead of the pump. NAPA 3011. This filter sells for just about $4.00. The ONAN replacement was around $30.00.
Now the pump gets filtered fuel as well as the carb and the filter takes only a couple minutes to change. I also bought a spare fuel pump as I had heard they can be a trouble source. Good insurance IMO. I haven't needed it yet! LOL
Lynn
__________________
2002 Fleetwood Storm 30H on Workhorse P32 chassis 8.1 gas.
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05-19-2017, 05:49 PM
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#8
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Senior Member
Damon Owners Club
Join Date: Dec 2013
Location: GA
Posts: 196
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Had the same problem and got fixed it a fuel pump off amazon.
__________________
2018 Winnebago Aspect 30J
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05-20-2017, 07:13 AM
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#9
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Junior Member
Join Date: Apr 2017
Posts: 1
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Same thing happened to me with that exact generator when new motorhome was less than 3 months old. It was the low engine oil automatic shut down. Regards.
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05-20-2017, 01:19 PM
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#10
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Senior Member
Join Date: Feb 2017
Posts: 262
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I changed my control board had a bad relay would act up when hot replace it with a dinosaur unit
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